1,265 prompts matching "Practice: Using a table of signs to solve a quadratic inequality"
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Common Mistakes: Arrangements restricted at the first or the last place
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Worked Example: The difference between a permutation and a combination
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Spot My Mistake: The identity that n choose r equals n choose n minus r
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Show All Working: Counting the handshakes, or the lines joining n points
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Learn: The Pythagorean identity, sin squared plus cos squared equals one
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Worked Example: The identities for one plus tan squared and one plus cot squared
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Spot My Mistake: The double angle formula for sine
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Show All Working: The half angle formulae and the t-substitution
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Learn: Solving sin x equals a given value between 0 and 360 degrees
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Worked Example: Solving cos x equals a negative value, and finding both solutions
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Spot My Mistake: Solving an equation by first applying a Pythagorean identity
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Show All Working: Solving a cos x plus b sin x equals c by the R method
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Learn: The distance between two points
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Spot My Mistake: The general form ax plus by plus c equals nought
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Show All Working: Proving two given lines perpendicular from their gradients
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Common Mistakes: The angle between two lines found from their gradients
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Quiz: Finding the centre and the radius from the general equation
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Explain Back: Deciding whether a point lies inside, on or outside a circle
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Learn: The parabola y squared equals 4ax, with its focus and directrix
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Show All Working: The rectangular hyperbola xy equals c squared
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